Split stator



June 28, 1949. G. F. BEHRINGER SPLIT sTAToR Filed May 30, 1944 Patented June 28, 1949 UNITED STATES PATENT OFFICE SPLIT STATOR Application May 3l), 1944, Serial No. 538,085

(Cl. F75-41.5)

l Claim. l.

My present invention relates to electrical condensers, especially those usually employed in radio receiving and transmitting sets and in which there is a split stator or arrangement of stator plates in a plurality of series, which series must be insulated from each other.

One object of the invention is to provide a oommon means for supporting the various series of the stator plate assembly, thus eliminating individual supports from the frame of the condenser to each series of stator plates and the attendant difficulty in aligning the plates of each series with the rotor of the condenser.

Another object is to provide suc-h common mounting means in the form of a mounting plate arrangement comprising insulating plates which properly space the various series of stator plates and rigidly hold them in their spaced relation to each other, the insulating plates being reinforced inside and out by metal mounting plates and/or retainer plates which are provided for each series of stator plates and properly space the plates thereof, whereas the insulation plates embrace all the stator plates thus minimizing the production cost of a split stator plate unit.

A further object is to provide such a stator plate unit which may be mounted in a condenser frame and accurately positioned relative thereto by means of a suitable assembling jig with the mounting plate arrangement adjacent mounting posts which project from the condenser frame and to which the mounting plate arrangements are then soldered so that upon chilling of the solder and removal of the assembling jig, ac-

curacy in the placement of the stator plates with relation to the bearings for a rotor shaft is assured and mounting of the shaft and its rotor thereafter will always result in the rotor blades being equally spaced ybetween the blades of the stator and in the proper parallel position with L relation thereto.

Still a further object is to provide a split stator assembly which is an improvement from the standpoint of cost of parts and assembly time when compared with my former Patent No. 1,934,907 issued November 14, 1944.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of my split denser showing one of my split stators mounted therein and a mounting post for a second one.

Fig. 2 is an end elevation of Fig. 1.

Fig. 3 is a bottom plan view of Fig. l.

Figs. 4, 5, 6, l and 8 are perspective views of diiferent parts of the mounting plate assembly which will be hereinafter referred to specifically.

Fig. 9 is a sectional View on the line 9 9 of Fig. 1.

Fig. 10 is an enlarged sectional view on the line I-ID of Fig. 9.

Figs. 1l, 12 and 13 are enlarged views of a portion of Fig. 9 showing the parts during different assembly operations and the final assembled positon in Fig. 13, and

Fig. 14 is a perspective View of one of the stator plates after the mounting means has Ibeen assembled relative thereto and then removed.

On the accompanying drawings, I have used the reference character F to indicate a frame. Within the frame F is a split stator, that is, a stator having two or more series of plates or sections such as S and S. Each section comprises a series of stator plates and one of the plurality of series may have only a single plate such as illustrated for the stator section S'.

The stator plates are all of the same shape and have been referred to in general by the reference numeral lll. Each stator plate has a pair of recesses l2 for a mounting plate arrangement and the sides of these recesses are indicated at I4 and It as perhaps best shown in Fig. 11.

In each recess is a first mounting plate lll or 88a as the case may be. The mounting'plate I8 is for a plurality of stator plates and accordingly has a plurality of notches 2li in its opposite side edges. The mounting plate la is actually only a narrow strip of metal as shown in Fig. 4 as it is for a single stator plate (S). It has a notch tta at one end and a slot Zlib serving as a notch at the other end and at the same time having an extension to provide a terminal as by means cfa perforation 22 into which a wire may be soldered.

A second mounting plate is provided and it is shown in Fig. 5. It bears the reference numeral 24, is made of insulating material, and like the mounting plate i6, has notches in its sides (desig nated 25). The insulation plate 24, it will be noted, extends across the entire series of stator plates S` and S as best shown in Fig. 10. The plate 24 is formed of a dielectric material so as to electrically isolate the stator section S relative to the stator section S yet rigidly connect them together in a mechanical sense for support 3 in relation to the frame F as will hereinafter appear.

A third supporting plate which also acts as a retainer plate is shown at 28. A corresponding narrow plate 28a is provided, the two plates being shown respectively in Figs. 6 and 8. These plates, it will be noted, are initially bowed or formed as two anges at an obtuse angle to eachother for an important purpose which will hereinafter be brought forth.

Referring to Fig. 11, it will be noted that the supporting plates I8, 24 and 28 have been` inn serted into the recess I2 of a stator plate I0;

These plates are preferably held in` an assemblyjig that properly spaces themso. thatthe plates I8, 24 and 28 may be readily placed with their notches 2U, 26 and 29 receiving the edges I4 and I6 of the stator plates. The dotted position shows the initial position of the plate 2S, after which it is swung in the direction of the arrow artoseat against'the bottom of the recess I2. The.

edge I6is slightly slanted-,outward to permit euch swinging of thisplat'efand.also-theplates 2t` and 28 to the final position-shown'in this figure'.

The third supporting plate or retainer plate 28'is then straightened out. to nearly hat po sition 'by pressure as indicated by the arrow. i) in` Fig. lZWhicl-l increasesr its effective width and in actual practice causes the edges of the plate 28fadjacent the bcttomoil the notches 29 therein to dig into the recess sides I4 and I6 aslndicated at Ilia and lila. Each stator plate then actually hasrthev shape shownin Fig. lwith the retainer plate 28 accomplishing its. retaining actionv by its edges actually digging into the stator plate at I'4a and Ita (shown somewhat exaggerated) and the attened portion 30 aiding in the retention of the supporting plate assembly rigidlyv relative to the stator plates. Fig. 14 illustrates the iinal shapefoi the stator plateif the plates. I8, 24.and

28 are removed, the depth of thenotch portions I4a and Ilia being slightly exaggeratedior clar ity. During pressure application atV hoi' in a fol.-

lowing operation theouter end of the edge i6- may be flattened slightly as indicated at. 3.81m,

Fig. 13.

lin a, manner similar to.- that just described,

pressure as at b is also applied.-to-theretainer plate 28a as will be obvious and thus each sectionv ofthe stator is rigidly supported onthe support ing plate assembly with the insulatingl plate 24. serving as a mechanical conneotionbetween the stator sections and, at the Sametime, electrically insulating them from eachother.

It will be notedthatv Ihave described but onev placed in position, the frame.l is peenedl against. the edges of the insulating washersy byseries; of depressions 38 around the edges ofthe pier-Y forations 36, both on the inner surface and thel outer. surface of the irameF. This contracts the sizeof the opening 36;-to effect, a` rigid mounting,v

of the insulating washers'inv the frame.

After the stator has been assembled in relation to its two supporting plate assemblies, it is held by a suitable assembly jig in the position shown in Fig. 9 and a drop of solder 40 used to connect each mounting post to the supporting plate assembly. The solder adheres to the upper end of the post and to the outer supporting or retainer plate 28; When the solder has chilled, the assembly jig is removed and the assembler is assured that the stator plates are in the proper position with respect to a bearing opening 42 in one end of the frame and a ball thrust bearing seat 44 in the other end for the shaft of the rotor asshown in my prior patent. As the rotor forms no part of my present invention, I have not shown it.

The supporting means disclosed for the stator plates properly spaces them with relation to each other by the notches 2U and 20a in the plates I8 and I8a and also by the notches in the insulatingfplate andfthe retainer plates 23=and28a. The recesses l2 are spaced from each other and are ati substantially right angles to each other which, together with the width of the mounting plate assembly, gives a four point support for each stator plate that assures their alignment relative toeach other and equal spacing between allparts ofthe plates without any chance of the plates inclining towardor away from each other atztheir upper unsupported edges.

The mounting plates i8, 24 and 28 may be quickly assembled by unskilled labor after a little practice and the plate '5B-flattened as inFig. 13, followed by the recess ends I6 being flattened at tfto provide an accurately assembled'stator Stogether with its section s in rigidly supported re. tion thereto. The assembly is such that after completion', the entire stator may be. readily mounted. in the. frame F and locatedv inv an exact position relative thereto by the use oi a proper assembly jig followed by the soldering operations at till that permit variation in the placement of the mounting posts but insure that when the stator is supported by the solder relative thereto, the stator `will be properly aligned with the frame. All of these ,features contribute toan inexpensive split stator assembly well adapted `lor quantity production and 'to the fabrication of relatively small and therefore inexpensive condensers for radio work. Small size is very desirable in connection withhome radio as well as those that areA used. in airplanes where weight is an all-impor tant consideration.

My assembly andthe method of performing it is. readily` adaptable for the production of condensers with great accuracy in. respect tothe s acing of the plates because they may be closely spaced to. out down the overall dimensions andi yet retain the needed capacity which can be.

securedin. air dielectric eondensers by reducing the spacing and therefore the necessary size of the plates.

Some changes may oe made in the construction andarrangcment ci the parts of my split stator without departing from the real spirit and purpose oi my invention, and it is my intention to cover by my claims any modifiedforms` of structure or use of mechanical equivalents which may be reasonably includedwithin their scope without sacrificing any oi theadvantages thereof.

I` claim.:

A split condenser stator comprising a plurality of ci; statorplates havingy recesses in their edges, and common for supporting all ofsai'dfseries;ofy plates andi insulating said series from each other, said means comprising a dielectric mounting plate for all of said series having notches in its edges receiving opposite side edges of the recesses in said stator plates, a plurality of spaced expandable retainer plates, one for each series of stator plates, said retainer plates having notches in their edges receiving opposite side edges of the recesses in said stator plates, said retainer plates being positioned in said recesses and being adapted to be expanded to grip the side edges of said recesses, and a reinforcing plate for each series of stator plates spaced from each other and being disposed in said recesses in the stator plate prior to the dielectric plate and said expandable plate, al1 three of said plates being tightly held in engagement with each other by said expandable plate.

GROVER F. BEHRINGER.

REFERENCES CITED The following referenlces are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,058,210 Welch Apr. 8, 1913 1,934,907 Behringer Nov. 14, 1933 m 1,940,854 Forbes Dec.26,19334 2,010,584 Cramer Aug. 6, 1935 2,105,659 Jacobi Jan. 18, 1938 2,264,502 Behringer Dec. 2, 1941 FOREIGN PATENTS 15 Number Country Date 8,829 Great Britain Oct. 13, 1913 480,537 Great Britain Feb. 22, 1938 

